Ship lighting usually includes ensuring navigation safety and safety lighting for personnel (such as navigation lights, signal lights, lighting in boarding and landing areas), lighting of the ship's workplace (such as cab, cabin and deck lighting) and lighting in living areas. Ship lighting can be roughly classified according to its function (1) Indoor lighting: main cabin lighting; local auxiliary lighting; entertainment and beautification atmosphere lighting; (2) Outdoor lighting: outdoor channel lighting; outdoor work lighting (deck lighting); (3) searchlights and spotlights; (4) Navigation lights.Can also be classified according to the power supply mode as follows: (1) Normal lighting (ship main power supply) (2) Emergency lighting (emergency power supply); The emergency lighting power supply can be divided into: emergency generator power supply, battery pack power supply. (3) Temporary emergency lighting (commonly known as small emergency lighting; battery pack power supply for half an hour)